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NAME | C SYNOPSIS | DESCRIPTION | SEE ALSO | COLOPHON |
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PMOPENLOG(3) Library Functions Manual PMOPENLOG(3)
pmOpenLog - create a log file for diagnostics and debug output
#include <pcp/pmapi.h>
FILE *pmOpenLog(const char *progname, const char *logname,
FILE *oldstream, int *status);
cc ... -lpcp
pmOpenLog reassigns the standard I/O stream oldstream (normally
stderr) to be associated with the file logname. If logname is
not "-" and already exists, it will be removed and recreated if
possible (to ensure correct ownership and permissions from the
caller to pmOpenLog).
As a special case, if logname is "-" then no removal or reopening
is performed and the function simply sets status to 1 and returns
oldstream. This is useful when the caller wants diagnostics on
oldstream stream (normally stderr) rather than a file, e.g.
pmlogger -l- or pmcd -f -l-. Logging to stderr is also useful
for PMDAs in a containerized environment where it is beneficial
for all PMDA logs to be written to pmcd's stderr stream (and thus
to a single destination), whether that is a file such as pmcd.log
or the original stream inherited from the shell.
On return, the function value is the standard I/O stream,
possibly replacing oldstream. In the event of an error, the
return value will be oldstream unchanged and status will be 0.
For success, status is 1, and a standard preamble is written to
logname
Log for progname on hostname started date and time
and an atexit(3) handler is installed to write the postscript
message to logname
Log finished date and time
when the processes exits.
progname is only used to annotate messages.
atexit(3) and freopen(3).
This page is part of the PCP (Performance Co-Pilot) project.
Information about the project can be found at
⟨http://www.pcp.io/⟩. If you have a bug report for this manual
page, send it to pcp@groups.io. This page was obtained from the
project's upstream Git repository
⟨https://github.com/performancecopilot/pcp.git⟩ on 2022-12-17.
(At that time, the date of the most recent commit that was found
in the repository was 2022-12-16.) If you discover any rendering
problems in this HTML version of the page, or you believe there
is a better or more up-to-date source for the page, or you have
corrections or improvements to the information in this COLOPHON
(which is not part of the original manual page), send a mail to
man-pages@man7.org
Performance Co-Pilot PCP PMOPENLOG(3)
Pages that refer to this page: pmnotifyerr(3)
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